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प्रश्न
Which of the following statements are true?
(i) sudden action in response to something in the environment is called reflex action
(ii) sensory neurons carry electrical signals from spinal cord to muscles in a reflex action
(iii) motor neurons carry signals from receptors to spinal cord in a reflex action
(iv) the pathway of transmitting signals from a receptor to a muscle is a reflex action
पर्याय
(i) and (ii)
(i) and (iii)
(i) and (iv)
(i), (ii) and (iii)
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उत्तर
(i) and (iv)
Explanation:
Statements (i) and (iv) are correct, while statements (ii) and (iii) are not. Sensory neurons carry signals from the receptors to the brain or the spinal cord, while motor neurons carry signals from the brain or the spinal cord to the effector organs like muscles and glands.
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संबंधित प्रश्न
The diagram given below shows the internal structure of a spinal cord depicting a phenomenon. Study the diagram and answer the questions:
1) Name the phenomenon that is depicted in the diagram. Define the phenomenon.
2) Give the technical term for the point of contact between the two nerve cells.
3) Name the parts numbered 1, 2 and 3.
4) How does the arrangement of neurons in the spinal cord differ from that of the brain?
5) Mention two ways by which the spinal cord is protected in our body.
State one function each of cerebellum and pons.
What is spinal cord? What is its main function?
What is a reflex action? Explain with the help of an example.
Define reflex arc. Give the flow chart of a spinal reflex arc.
The contraction of pupil of the eye in the presence of bright light is an example of :
(a) Voluntary reflex
(b) Spinal reflex
(c) Cerebral reflex
(d) Adrenal reflex
With the help of suitable example, describe reflex action.
Complete the following statement by choosing the correct alternative from the choice given in bracker:
Reflex action is controlled by
(i) brain (ii) spinal cord
(iii) autonomic (iii) peripheral nervous system
State whether the following is simple reflex, conditioned reflex or neither of the two:
Lifting up a book: …………………..
Two hungry boys (A and B) enter a restaurant and find a table decorated as follows:
Boy B starts salivating but not A. Explain the reason for this difference.
List in tabular form two differences between reflex action and walking.
What is a reflex action?
Reflex action is controlled by the
Give Reason:
The hand automatically shows the direction to turn a cycle without thinking.
Give an example for conditioned reflexes.
Which of the following is an example of unconditioned reflex?
Which sensory organ is involved in vertigo (sensation of oneself or objects spinning around)?
Why have reflex arcs evolved in animals?
Categorise the following under stimulus and response.
Pain in the eye if something falls into it.
